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Borrowings - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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May 31, 2018 USD ($) Trust | Dec. 20, 2017 USD ($) | May 09, 2017 USD ($) | Dec. 09, 2013 USD ($) | Dec. 03, 2013 $ / shares | May 31, 2018 USD ($) Trust | Apr. 30, 2018 $ / shares | May 31, 2018 USD ($) Trust $ / shares | Feb. 28, 2018 $ / shares | Nov. 30, 2017 $ / shares | Aug. 31, 2017 $ / shares | May 31, 2017 USD ($) $ / shares | Feb. 28, 2017 $ / shares | Nov. 30, 2016 $ / shares | [2] | Aug. 31, 2016 $ / shares | May 31, 2018 USD ($) Trust $ / shares | May 31, 2017 USD ($) $ / shares | May 31, 2016 $ / shares | May 31, 2015 USD ($) | Mar. 31, 2017 | Mar. 02, 2017 USD ($) | May 29, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2019 |  | $ 3,500,000 |  |  |  |  |  | $ 3,500,000 |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2020 |  | 689,300,000 |  |  |  |  |  | 689,300,000 |  |  | 689,300,000 |  |  |  |  |  |  |  |  |  | 689,300,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2021 |  | 196,900,000 |  |  |  |  |  | 196,900,000 |  |  | 196,900,000 |  |  |  |  |  |  |  |  |  | 196,900,000 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2022 |  | 0 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Maturities of long-term debt in 2023 |  | 296,900,000 |  |  |  |  |  | 296,900,000 |  |  | 296,900,000 |  |  |  |  |  |  |  |  |  | 296,900,000 |  |  |  |  |  |  |  |
Maturities of long-term debt thereafter |  | 1,011,100,000 |  |  |  |  |  | 1,011,100,000 |  |  | 1,011,100,000 |  |  |  |  |  |  |  |  |  | 1,011,100,000 |  |  |  |  |  |  |  |
Credit facility, available liquidity |  | 762,400,000 |  |  |  |  |  | 762,400,000 |  |  | 762,400,000 |  |  |  |  |  |  |  |  |  | 762,400,000 |  |  |  |  |  |  |  |
Liquidity available |  | $ 1,010,000,000 |  |  |  |  |  | $ 1,010,000,000 |  |  | $ 1,010,000,000 |  |  |  |  |  |  |  |  |  | $ 1,010,000,000 |  |  |  |  |  |  |  |
Consolidated indebtedness |  | 57.10% |  |  |  |  |  | 57.10% |  |  | 57.10% |  |  |  |  | 59.30% |  |  |  |  | 57.10% |  | 59.30% |  |  |  |  |  |
Issuance of note |  | $ 205,000,000 |  |  |  |  |  | $ 205,000,000 |  |  | $ 205,000,000 |  |  |  |  | $ 205,000,000 |  |  |  |  | $ 205,000,000 |  | $ 205,000,000 |  |  |  |  |  |
Repayments of unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |  |  |
Credit facility borrowing potential maximum capacity |  | 1,000,000,000 |  |  |  |  |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  | $ 1,000,000,000 |  |  |
Amount funded for trust as per agreement |  | $ 450,000,000 |  |  |  |  |  | 450,000,000 |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |
Remaining trust payment prepaid |  |  |  |  |  |  |  | $ 123,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of remaining trust payments due | Trust |  | 0 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Outstanding balance |  | $ 0 |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  |  |  |  | 18.8905 |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.159777 |  |  |  |  |  |  |  |
Convertible notes, initial conversion price per share | $ / shares |  |  |  |  |  |  | $ 52.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price, conversion premium percentage |  |  |  |  |  |  | 37.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Last reported sale price of RPM common stock | $ / shares |  |  |  |  |  |  | $ 38.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.320 | [1] | $ 0.320 | $ 0.320 | $ 0.300 | $ 0.300 |  | $ 0.300 | $ 0.300 | $ 0.275 | $ 1.260 |  | $ 1.175 |  | $ 1.085 |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the Convertible Notes semi-annually on June 15th and December 15th of each year |  |  |  |  |  |  |  |
Notes maturity date |  |  |  |  |  | 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.92% |  |  |  |  |  | 3.92% |  |  | 3.92% |  |  |  |  |  |  |  |  |  | 3.92% |  |  |  |  |  |  |  |
Contractual interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000 |  | $ 4,600,000 |  |  |  |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  | $ 2,900,000 |  |  |  |  |  |
Debt discount remaining amortized period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |  |
Unamortized debt discount |  | $ 8,100,000 |  |  |  |  |  | $ 8,100,000 |  |  | $ 8,100,000 |  |  |  |  |  |  |  |  |  | $ 8,100,000 |  |  |  |  |  |  |  |
Carrying amount of the equity component of debt |  | $ 20,700,000 |  |  |  |  |  | 20,700,000 |  |  | 20,700,000 |  |  |  |  |  |  |  |  |  | 20,700,000 |  |  |  |  |  |  |  |
Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  | $ 562,400,000 |  |  |  |  |  | $ 562,400,000 |  |  | $ 562,400,000 |  |  |  |  |  |  |  |  |  | $ 562,400,000 |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 05, 2019 |  | Dec. 05, 2019 |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |
Credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 05, 2019 |  |  |
Interest coverage ratio |  | 740.00% |  |  |  |  |  | 740.00% |  |  | 740.00% |  |  |  |  |  |  |  |  |  | 740.00% |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.90% |  |  |  |  |  |  |  |
Unsecured 4.25% notes due January 15, 2048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 300,000,000 |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Debt, interest rate |  | 4.25% | [4] | 4.25% |  |  |  | 4.25% | [4] |  | 4.25% | [4] |  |  |  |  |  |  |  |  | 4.25% | [4] |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 15, 2048 |  |  |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2048 Notes accrues from December 20, 2017 and is payable semiannually in arrears on January 15th and July 15th of each year, beginning July 15, 2018, at a rate of 4.250% per year. |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 4.25% |  |  |  |  |  | 4.25% |  |  | 4.25% |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |
Unsecured 6.50% senior notes due February 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured senior notes |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2018 |  |  |  |  |  |  |  |
Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 250,000,000 |  |  |  |  |  | $ 250,000,000 |  |  | $ 250,000,000 |  |  |  |  | $ 250,000,000 |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  | $ 50,000,000 | $ 250,000,000
Debt, interest rate |  | 5.25% | [5] |  |  |  |  | 5.25% | [5] |  | 5.25% | [5] |  |  |  | 5.25% | [5] |  |  |  | 5.25% | [5] | 5.25% | [5] |  |  |  | 5.25% | 5.25%
Unsecured senior notes , maturity date | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2045 Notes is payable semiannually in arrears on June 1st and December 1st of each year at a rate of 5.250% per year |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 5.29% |  |  |  |  |  | 5.29% |  |  | 5.29% |  |  |  |  |  |  |  |  |  | 5.29% |  |  |  |  |  | 4.839% |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  | $ 1,500,000 |  |  |  |  |  |
Unsecured 3.75% notes due March 15, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 400,000,000 |  |  |  |  |  | $ 400,000,000 |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |
Debt, interest rate |  | 3.75% | [6] |  |  |  |  | 3.75% | [6] |  | 3.75% | [6] |  |  |  | 3.75% | [6] |  |  |  | 3.75% | [6] | 3.75% | [6] |  |  |  | 3.75% |
Unsecured senior notes , maturity date | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 15, 2027 |  | Mar. 15, 2027 |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2027 Notes is payable semiannually in arrears on March 15th and September 15th of each year, at a rate of 3.750% per year |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.767% |  |  |  |  |  | 3.767% |  |  | 3.767% |  |  |  |  |  |  |  |  |  | 3.767% |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  | $ 500,000 |  |  |  |  |  |
Issuance of Debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness |  | 65.00% |  |  |  |  |  | 65.00% |  |  | 65.00% |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |
Issuance of Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 350.00% |  |  |  |  |  | 350.00% |  |  | 350.00% |  |  |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |
New Accounts Receivable Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 2.25% senior convertible notes due December 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  | 2.25% |  |  |  |  |  | 2.25% |  |  | 2.25% |  |  |  |  | 2.25% |  |  |  |  | 2.25% |  | 2.25% |  |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2020 |  | Dec. 15, 2020 |  |  |  |  |  |
Unsecured 2.25% senior convertible notes due December 15, 2020 | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Reflects inventory-related charges of $36.5 million in our consumer reportable segment for product line rationalization and related obsolete inventory identification and $1.2 million in inventory reductions related to restructuring activities in our industrial reportable segment. Additional restructuring charges totaling $17.5 million were incurred during the fourth quarter of fiscal 2018, as further described in Note B, “Restructuring.” We also incurred charges in our industrial segment totaling $4.2 million in connection with the decision to exit Flowcrete China.
[2] | Reflects the pretax goodwill and intangible asset impairment losses of $188.3 million related to our Kirker reporting unit. Refer to Note C, “Goodwill and Other Intangible Assets,” for further information. Also reflects $12.3 million pretax charge relating to the Flowcrete decision to exit the Middle East and $15.0 million in severance expense across all three reportable segments.
[3] | Interest was tied to AUD LIBOR at May 31, 2018, and averaged 2.925% for AUD denominated debt ($23,309) and 0.675% on EUR denominated debt ($213,708). Interest was tied to AUD LIBOR at May 31, 2017, and averaged 2.705% for AUD denominated debt ($17,311), 1.075% on EUR denominated debt ($183,012). At May 31, 2018 and 2017, the revolving credit facility is adjusted for debt issuance costs, net of amortization, for approximately $1.2 million and $2.0 million, respectively.
[4] | The $300.0 million face amount of the notes due 2048 is adjusted for the debt issuance cost, net of amortization, which approximated $3.6 million at May 31, 2018. The effective interest rate on the notes is 4.25%.
[5] | The $250.0 million face amount of the notes due 2045 is adjusted for the amortization of the original issue discount, which approximated $1.4 million and $1.5 million at May 31, 2018 and 2017, respectively. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, is 5.29%. In March 2017, as a further issuance of the 5.25% notes due 2045, we closed an offering of $50.0 million aggregate principal, which is adjusted for the unamortized premium received at issuance, which approximated $3.0 million and $3.1 million at May 31, 2018 and 2017, respectively. The premium effectively increased the proceeds from the financing. The effective interest rate on the $50.0 million notes issued March 2017 is 4.839%. At May 31, 2018 and 2017, the notes are adjusted for debt issuance costs, net of amortization, for approximately $3.1 million and $3.2 million, respectively.
[6] | The $400.0 million face amount of the notes due 2027 is adjusted for the amortization of the original issue discount, which approximated $0.5 million at May 31, 2018 and 2017. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, is 3.767%. At May 31, 2018 and 2017, the notes are adjusted for debt issuance costs, net of amortization, for approximately $3.4 million and $3.8 million, respectively.

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